Rhinoceroses get their name from their most famous feature: their horns. The word rhinoceros comes from the Greek rhino (nose) and ceros (horn). For ages, rhino horn has been used to treat illnesses, especially fevers. Yet like our fingernails and hair, rhino horn is made of keratin and has no healing properties. In some countries, rhinos are being dehorned, a process that removes the valuable horn but leaves the animal alive and well. This prevents poachers from killing rhinos for the money their horns would bring.